[mirror_ubuntu-jammy-kernel.git] / drivers / leds / leds-netxbig.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs
 *
 * Copyright (C) 2010 LaCie
 *
 * Author: Simon Guinot <sguinot@lacie.com>
 */

#include <linux/module.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/leds.h>

struct netxbig_gpio_ext {
	unsigned int	*addr;
	int		num_addr;
	unsigned int	*data;
	int		num_data;
	unsigned int	enable;
};

enum netxbig_led_mode {
	NETXBIG_LED_OFF,
	NETXBIG_LED_ON,
	NETXBIG_LED_SATA,
	NETXBIG_LED_TIMER1,
	NETXBIG_LED_TIMER2,
	NETXBIG_LED_MODE_NUM,
};

#define NETXBIG_LED_INVALID_MODE NETXBIG_LED_MODE_NUM

struct netxbig_led_timer {
	unsigned long		delay_on;
	unsigned long		delay_off;
	enum netxbig_led_mode	mode;
};

struct netxbig_led {
	const char	*name;
	const char	*default_trigger;
	int		mode_addr;
	int		*mode_val;
	int		bright_addr;
	int		bright_max;
};

struct netxbig_led_platform_data {
	struct netxbig_gpio_ext	*gpio_ext;
	struct netxbig_led_timer *timer;
	int			num_timer;
	struct netxbig_led	*leds;
	int			num_leds;
};

/*
 * GPIO extension bus.
 */

static DEFINE_SPINLOCK(gpio_ext_lock);

static void gpio_ext_set_addr(struct netxbig_gpio_ext *gpio_ext, int addr)
{
	int pin;

	for (pin = 0; pin < gpio_ext->num_addr; pin++)
		gpio_set_value(gpio_ext->addr[pin], (addr >> pin) & 1);
}

static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data)
{
	int pin;

	for (pin = 0; pin < gpio_ext->num_data; pin++)
		gpio_set_value(gpio_ext->data[pin], (data >> pin) & 1);
}

static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext)
{
	/* Enable select is done on the raising edge. */
	gpio_set_value(gpio_ext->enable, 0);
	gpio_set_value(gpio_ext->enable, 1);
}

static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext,
			       int addr, int value)
{
	unsigned long flags;

	spin_lock_irqsave(&gpio_ext_lock, flags);
	gpio_ext_set_addr(gpio_ext, addr);
	gpio_ext_set_data(gpio_ext, value);
	gpio_ext_enable_select(gpio_ext);
	spin_unlock_irqrestore(&gpio_ext_lock, flags);
}

static int gpio_ext_init(struct platform_device *pdev,
			 struct netxbig_gpio_ext *gpio_ext)
{
	int err;
	int i;

	if (unlikely(!gpio_ext))
		return -EINVAL;

	/* Configure address GPIOs. */
	for (i = 0; i < gpio_ext->num_addr; i++) {
		err = devm_gpio_request_one(&pdev->dev, gpio_ext->addr[i],
					    GPIOF_OUT_INIT_LOW,
					    "GPIO extension addr");
		if (err)
			return err;
	}
	/* Configure data GPIOs. */
	for (i = 0; i < gpio_ext->num_data; i++) {
		err = devm_gpio_request_one(&pdev->dev, gpio_ext->data[i],
					    GPIOF_OUT_INIT_LOW,
					    "GPIO extension data");
		if (err)
			return err;
	}
	/* Configure "enable select" GPIO. */
	err = devm_gpio_request_one(&pdev->dev, gpio_ext->enable,
				    GPIOF_OUT_INIT_LOW,
				    "GPIO extension enable");
	if (err)
		return err;

	return 0;
}

/*
 * Class LED driver.
 */

struct netxbig_led_data {
	struct netxbig_gpio_ext	*gpio_ext;
	struct led_classdev	cdev;
	int			mode_addr;
	int			*mode_val;
	int			bright_addr;
	struct			netxbig_led_timer *timer;
	int			num_timer;
	enum netxbig_led_mode	mode;
	int			sata;
	spinlock_t		lock;
};

static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode,
				      unsigned long delay_on,
				      unsigned long delay_off,
				      struct netxbig_led_timer *timer,
				      int num_timer)
{
	int i;

	for (i = 0; i < num_timer; i++) {
		if (timer[i].delay_on == delay_on &&
		    timer[i].delay_off == delay_off) {
			*mode = timer[i].mode;
			return 0;
		}
	}
	return -EINVAL;
}

static int netxbig_led_blink_set(struct led_classdev *led_cdev,
				 unsigned long *delay_on,
				 unsigned long *delay_off)
{
	struct netxbig_led_data *led_dat =
		container_of(led_cdev, struct netxbig_led_data, cdev);
	enum netxbig_led_mode mode;
	int mode_val;
	int ret;

	/* Look for a LED mode with the requested timer frequency. */
	ret = netxbig_led_get_timer_mode(&mode, *delay_on, *delay_off,
					 led_dat->timer, led_dat->num_timer);
	if (ret < 0)
		return ret;

	mode_val = led_dat->mode_val[mode];
	if (mode_val == NETXBIG_LED_INVALID_MODE)
		return -EINVAL;

	spin_lock_irq(&led_dat->lock);

	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
	led_dat->mode = mode;

	spin_unlock_irq(&led_dat->lock);

	return 0;
}

static void netxbig_led_set(struct led_classdev *led_cdev,
			    enum led_brightness value)
{
	struct netxbig_led_data *led_dat =
		container_of(led_cdev, struct netxbig_led_data, cdev);
	enum netxbig_led_mode mode;
	int mode_val;
	int set_brightness = 1;
	unsigned long flags;

	spin_lock_irqsave(&led_dat->lock, flags);

	if (value == LED_OFF) {
		mode = NETXBIG_LED_OFF;
		set_brightness = 0;
	} else {
		if (led_dat->sata)
			mode = NETXBIG_LED_SATA;
		else if (led_dat->mode == NETXBIG_LED_OFF)
			mode = NETXBIG_LED_ON;
		else /* Keep 'timer' mode. */
			mode = led_dat->mode;
	}
	mode_val = led_dat->mode_val[mode];

	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
	led_dat->mode = mode;
	/*
	 * Note that the brightness register is shared between all the
	 * SATA LEDs. So, change the brightness setting for a single
	 * SATA LED will affect all the others.
	 */
	if (set_brightness)
		gpio_ext_set_value(led_dat->gpio_ext,
				   led_dat->bright_addr, value);

	spin_unlock_irqrestore(&led_dat->lock, flags);
}

static ssize_t netxbig_led_sata_store(struct device *dev,
				      struct device_attribute *attr,
				      const char *buff, size_t count)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct netxbig_led_data *led_dat =
		container_of(led_cdev, struct netxbig_led_data, cdev);
	unsigned long enable;
	enum netxbig_led_mode mode;
	int mode_val;
	int ret;

	ret = kstrtoul(buff, 10, &enable);
	if (ret < 0)
		return ret;

	enable = !!enable;

	spin_lock_irq(&led_dat->lock);

	if (led_dat->sata == enable) {
		ret = count;
		goto exit_unlock;
	}

	if (led_dat->mode != NETXBIG_LED_ON &&
	    led_dat->mode != NETXBIG_LED_SATA)
		mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */
	else if (enable)
		mode = NETXBIG_LED_SATA;
	else
		mode = NETXBIG_LED_ON;

	mode_val = led_dat->mode_val[mode];
	if (mode_val == NETXBIG_LED_INVALID_MODE) {
		ret = -EINVAL;
		goto exit_unlock;
	}

	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
	led_dat->mode = mode;
	led_dat->sata = enable;

	ret = count;

exit_unlock:
	spin_unlock_irq(&led_dat->lock);

	return ret;
}

static ssize_t netxbig_led_sata_show(struct device *dev,
				     struct device_attribute *attr, char *buf)
{
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct netxbig_led_data *led_dat =
		container_of(led_cdev, struct netxbig_led_data, cdev);

	return sprintf(buf, "%d\n", led_dat->sata);
}

static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store);

static struct attribute *netxbig_led_attrs[] = {
	&dev_attr_sata.attr,
	NULL
};
ATTRIBUTE_GROUPS(netxbig_led);

static int create_netxbig_led(struct platform_device *pdev,
			      struct netxbig_led_platform_data *pdata,
			      struct netxbig_led_data *led_dat,
			      const struct netxbig_led *template)
{
	spin_lock_init(&led_dat->lock);
	led_dat->gpio_ext = pdata->gpio_ext;
	led_dat->cdev.name = template->name;
	led_dat->cdev.default_trigger = template->default_trigger;
	led_dat->cdev.blink_set = netxbig_led_blink_set;
	led_dat->cdev.brightness_set = netxbig_led_set;
	/*
	 * Because the GPIO extension bus don't allow to read registers
	 * value, there is no way to probe the LED initial state.
	 * So, the initial sysfs LED value for the "brightness" and "sata"
	 * attributes are inconsistent.
	 *
	 * Note that the initial LED state can't be reconfigured.
	 * The reason is that the LED behaviour must stay uniform during
	 * the whole boot process (bootloader+linux).
	 */
	led_dat->sata = 0;
	led_dat->cdev.brightness = LED_OFF;
	led_dat->cdev.max_brightness = template->bright_max;
	led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
	led_dat->mode_addr = template->mode_addr;
	led_dat->mode_val = template->mode_val;
	led_dat->bright_addr = template->bright_addr;
	led_dat->timer = pdata->timer;
	led_dat->num_timer = pdata->num_timer;
	/*
	 * If available, expose the SATA activity blink capability through
	 * a "sata" sysfs attribute.
	 */
	if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
		led_dat->cdev.groups = netxbig_led_groups;

	return devm_led_classdev_register(&pdev->dev, &led_dat->cdev);
}

static int gpio_ext_get_of_pdata(struct device *dev, struct device_node *np,
				 struct netxbig_gpio_ext *gpio_ext)
{
	int *addr, *data;
	int num_addr, num_data;
	int ret;
	int i;

	ret = of_gpio_named_count(np, "addr-gpios");
	if (ret < 0) {
		dev_err(dev,
			"Failed to count GPIOs in DT property addr-gpios\n");
		return ret;
	}
	num_addr = ret;
	addr = devm_kcalloc(dev, num_addr, sizeof(*addr), GFP_KERNEL);
	if (!addr)
		return -ENOMEM;

	for (i = 0; i < num_addr; i++) {
		ret = of_get_named_gpio(np, "addr-gpios", i);
		if (ret < 0)
			return ret;
		addr[i] = ret;
	}
	gpio_ext->addr = addr;
	gpio_ext->num_addr = num_addr;

	ret = of_gpio_named_count(np, "data-gpios");
	if (ret < 0) {
		dev_err(dev,
			"Failed to count GPIOs in DT property data-gpios\n");
		return ret;
	}
	num_data = ret;
	data = devm_kcalloc(dev, num_data, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	for (i = 0; i < num_data; i++) {
		ret = of_get_named_gpio(np, "data-gpios", i);
		if (ret < 0)
			return ret;
		data[i] = ret;
	}
	gpio_ext->data = data;
	gpio_ext->num_data = num_data;

	ret = of_get_named_gpio(np, "enable-gpio", 0);
	if (ret < 0) {
		dev_err(dev,
			"Failed to get GPIO from DT property enable-gpio\n");
		return ret;
	}
	gpio_ext->enable = ret;

	return 0;
}

static int netxbig_leds_get_of_pdata(struct device *dev,
				     struct netxbig_led_platform_data *pdata)
{
	struct device_node *np = dev->of_node;
	struct device_node *gpio_ext_np;
	struct device_node *child;
	struct netxbig_gpio_ext *gpio_ext;
	struct netxbig_led_timer *timers;
	struct netxbig_led *leds, *led;
	int num_timers;
	int num_leds = 0;
	int ret;
	int i;

	/* GPIO extension */
	gpio_ext_np = of_parse_phandle(np, "gpio-ext", 0);
	if (!gpio_ext_np) {
		dev_err(dev, "Failed to get DT handle gpio-ext\n");
		return -EINVAL;
	}

	gpio_ext = devm_kzalloc(dev, sizeof(*gpio_ext), GFP_KERNEL);
	if (!gpio_ext)
		return -ENOMEM;
	ret = gpio_ext_get_of_pdata(dev, gpio_ext_np, gpio_ext);
	if (ret)
		return ret;
	of_node_put(gpio_ext_np);
	pdata->gpio_ext = gpio_ext;

	/* Timers (optional) */
	ret = of_property_count_u32_elems(np, "timers");
	if (ret > 0) {
		if (ret % 3)
			return -EINVAL;
		num_timers = ret / 3;
		timers = devm_kcalloc(dev, num_timers, sizeof(*timers),
				      GFP_KERNEL);
		if (!timers)
			return -ENOMEM;
		for (i = 0; i < num_timers; i++) {
			u32 tmp;

			of_property_read_u32_index(np, "timers", 3 * i,
						   &timers[i].mode);
			if (timers[i].mode >= NETXBIG_LED_MODE_NUM)
				return -EINVAL;
			of_property_read_u32_index(np, "timers",
						   3 * i + 1, &tmp);
			timers[i].delay_on = tmp;
			of_property_read_u32_index(np, "timers",
						   3 * i + 2, &tmp);
			timers[i].delay_off = tmp;
		}
		pdata->timer = timers;
		pdata->num_timer = num_timers;
	}

	/* LEDs */
	num_leds = of_get_child_count(np);
	if (!num_leds) {
		dev_err(dev, "No LED subnodes found in DT\n");
		return -ENODEV;
	}

	leds = devm_kcalloc(dev, num_leds, sizeof(*leds), GFP_KERNEL);
	if (!leds)
		return -ENOMEM;

	led = leds;
	for_each_child_of_node(np, child) {
		const char *string;
		int *mode_val;
		int num_modes;

		ret = of_property_read_u32(child, "mode-addr",
					   &led->mode_addr);
		if (ret)
			goto err_node_put;

		ret = of_property_read_u32(child, "bright-addr",
					   &led->bright_addr);
		if (ret)
			goto err_node_put;

		ret = of_property_read_u32(child, "max-brightness",
					   &led->bright_max);
		if (ret)
			goto err_node_put;

		mode_val =
			devm_kcalloc(dev,
				     NETXBIG_LED_MODE_NUM, sizeof(*mode_val),
				     GFP_KERNEL);
		if (!mode_val) {
			ret = -ENOMEM;
			goto err_node_put;
		}

		for (i = 0; i < NETXBIG_LED_MODE_NUM; i++)
			mode_val[i] = NETXBIG_LED_INVALID_MODE;

		ret = of_property_count_u32_elems(child, "mode-val");
		if (ret < 0 || ret % 2) {
			ret = -EINVAL;
			goto err_node_put;
		}
		num_modes = ret / 2;
		if (num_modes > NETXBIG_LED_MODE_NUM) {
			ret = -EINVAL;
			goto err_node_put;
		}

		for (i = 0; i < num_modes; i++) {
			int mode;
			int val;

			of_property_read_u32_index(child,
						   "mode-val", 2 * i, &mode);
			of_property_read_u32_index(child,
						   "mode-val", 2 * i + 1, &val);
			if (mode >= NETXBIG_LED_MODE_NUM) {
				ret = -EINVAL;
				goto err_node_put;
			}
			mode_val[mode] = val;
		}
		led->mode_val = mode_val;

		if (!of_property_read_string(child, "label", &string))
			led->name = string;
		else
			led->name = child->name;

		if (!of_property_read_string(child,
					     "linux,default-trigger", &string))
			led->default_trigger = string;

		led++;
	}

	pdata->leds = leds;
	pdata->num_leds = num_leds;

	return 0;

err_node_put:
	of_node_put(child);
	return ret;
}

static const struct of_device_id of_netxbig_leds_match[] = {
	{ .compatible = "lacie,netxbig-leds", },
	{},
};
MODULE_DEVICE_TABLE(of, of_netxbig_leds_match);

static int netxbig_led_probe(struct platform_device *pdev)
{
	struct netxbig_led_platform_data *pdata;
	struct netxbig_led_data *leds_data;
	int i;
	int ret;

	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	if (!pdata)
		return -ENOMEM;
	ret = netxbig_leds_get_of_pdata(&pdev->dev, pdata);
	if (ret)
		return ret;

	leds_data = devm_kcalloc(&pdev->dev,
				 pdata->num_leds, sizeof(*leds_data),
				 GFP_KERNEL);
	if (!leds_data)
		return -ENOMEM;

	ret = gpio_ext_init(pdev, pdata->gpio_ext);
	if (ret < 0)
		return ret;

	for (i = 0; i < pdata->num_leds; i++) {
		ret = create_netxbig_led(pdev, pdata,
					 &leds_data[i], &pdata->leds[i]);
		if (ret < 0)
			return ret;
	}

	return 0;
}

static struct platform_driver netxbig_led_driver = {
	.probe		= netxbig_led_probe,
	.driver		= {
		.name		= "leds-netxbig",
		.of_match_table	= of_netxbig_leds_match,
	},
};

module_platform_driver(netxbig_led_driver);

MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:leds-netxbig");
Commit	Line	Data
1a59d1b8	1	// SPDX-License-Identifier: GPL-2.0-or-later
24467832 SG	2	/*
	3	* leds-netxbig.c - Driver for the 2Big and 5Big Network series LEDs
	4	*
	5	* Copyright (C) 2010 LaCie
	6	*
	7	* Author: Simon Guinot <sguinot@lacie.com>
24467832 SG	8	*/
	9
	10	#include <linux/module.h>
24467832 SG	11	#include <linux/irq.h>
	12	#include <linux/slab.h>
	13	#include <linux/spinlock.h>
	14	#include <linux/platform_device.h>
	15	#include <linux/gpio.h>
2976b179	16	#include <linux/of_gpio.h>
24467832	17	#include <linux/leds.h>
156189a6 MY	18
	19	struct netxbig_gpio_ext {
	20	unsigned int *addr;
	21	int num_addr;
	22	unsigned int *data;
	23	int num_data;
	24	unsigned int enable;
	25	};
	26
	27	enum netxbig_led_mode {
	28	NETXBIG_LED_OFF,
	29	NETXBIG_LED_ON,
	30	NETXBIG_LED_SATA,
	31	NETXBIG_LED_TIMER1,
	32	NETXBIG_LED_TIMER2,
	33	NETXBIG_LED_MODE_NUM,
	34	};
	35
	36	#define NETXBIG_LED_INVALID_MODE NETXBIG_LED_MODE_NUM
	37
	38	struct netxbig_led_timer {
	39	unsigned long delay_on;
	40	unsigned long delay_off;
	41	enum netxbig_led_mode mode;
	42	};
	43
	44	struct netxbig_led {
	45	const char *name;
	46	const char *default_trigger;
	47	int mode_addr;
	48	int *mode_val;
	49	int bright_addr;
	50	int bright_max;
	51	};
	52
	53	struct netxbig_led_platform_data {
	54	struct netxbig_gpio_ext *gpio_ext;
	55	struct netxbig_led_timer *timer;
	56	int num_timer;
	57	struct netxbig_led *leds;
	58	int num_leds;
	59	};
24467832 SG	60
	61	/*
	62	* GPIO extension bus.
	63	*/
	64
	65	static DEFINE_SPINLOCK(gpio_ext_lock);
	66
	67	static void gpio_ext_set_addr(struct netxbig_gpio_ext *gpio_ext, int addr)
	68	{
	69	int pin;
	70
	71	for (pin = 0; pin < gpio_ext->num_addr; pin++)
	72	gpio_set_value(gpio_ext->addr[pin], (addr >> pin) & 1);
	73	}
	74
	75	static void gpio_ext_set_data(struct netxbig_gpio_ext *gpio_ext, int data)
	76	{
	77	int pin;
	78
	79	for (pin = 0; pin < gpio_ext->num_data; pin++)
	80	gpio_set_value(gpio_ext->data[pin], (data >> pin) & 1);
	81	}
	82
	83	static void gpio_ext_enable_select(struct netxbig_gpio_ext *gpio_ext)
	84	{
	85	/* Enable select is done on the raising edge. */
	86	gpio_set_value(gpio_ext->enable, 0);
	87	gpio_set_value(gpio_ext->enable, 1);
	88	}
	89
	90	static void gpio_ext_set_value(struct netxbig_gpio_ext *gpio_ext,
	91	int addr, int value)
	92	{
	93	unsigned long flags;
	94
	95	spin_lock_irqsave(&gpio_ext_lock, flags);
	96	gpio_ext_set_addr(gpio_ext, addr);
	97	gpio_ext_set_data(gpio_ext, value);
	98	gpio_ext_enable_select(gpio_ext);
	99	spin_unlock_irqrestore(&gpio_ext_lock, flags);
	100	}
	101
cd010955 SG	102	static int gpio_ext_init(struct platform_device *pdev,
cd010955 SG	103	struct netxbig_gpio_ext *gpio_ext)
24467832 SG	104	{
	105	int err;
	106	int i;
	107
	108	if (unlikely(!gpio_ext))
	109	return -EINVAL;
	110
	111	/* Configure address GPIOs. */
	112	for (i = 0; i < gpio_ext->num_addr; i++) {
cd010955 SG	113	err = devm_gpio_request_one(&pdev->dev, gpio_ext->addr[i],
	114	GPIOF_OUT_INIT_LOW,
	115	"GPIO extension addr");
24467832	116	if (err)
cd010955	117	return err;
24467832 SG	118	}
	119	/* Configure data GPIOs. */
	120	for (i = 0; i < gpio_ext->num_data; i++) {
cd010955 SG	121	err = devm_gpio_request_one(&pdev->dev, gpio_ext->data[i],
	122	GPIOF_OUT_INIT_LOW,
	123	"GPIO extension data");
24467832	124	if (err)
cd010955	125	return err;
24467832 SG	126	}
24467832 SG	127	/* Configure "enable select" GPIO. */
cd010955 SG	128	err = devm_gpio_request_one(&pdev->dev, gpio_ext->enable,
	129	GPIOF_OUT_INIT_LOW,
	130	"GPIO extension enable");
24467832	131	if (err)
cd010955	132	return err;
24467832 SG	133
24467832 SG	134	return 0;
24467832 SG	135	}
	136
	137	/*
	138	* Class LED driver.
	139	*/
	140
	141	struct netxbig_led_data {
	142	struct netxbig_gpio_ext *gpio_ext;
	143	struct led_classdev cdev;
	144	int mode_addr;
	145	int *mode_val;
	146	int bright_addr;
24467832 SG	147	struct netxbig_led_timer *timer;
	148	int num_timer;
	149	enum netxbig_led_mode mode;
	150	int sata;
	151	spinlock_t lock;
	152	};
	153
	154	static int netxbig_led_get_timer_mode(enum netxbig_led_mode *mode,
	155	unsigned long delay_on,
	156	unsigned long delay_off,
	157	struct netxbig_led_timer *timer,
	158	int num_timer)
	159	{
	160	int i;
	161
	162	for (i = 0; i < num_timer; i++) {
	163	if (timer[i].delay_on == delay_on &&
	164	timer[i].delay_off == delay_off) {
	165	*mode = timer[i].mode;
	166	return 0;
	167	}
	168	}
	169	return -EINVAL;
	170	}
	171
	172	static int netxbig_led_blink_set(struct led_classdev *led_cdev,
	173	unsigned long *delay_on,
	174	unsigned long *delay_off)
	175	{
	176	struct netxbig_led_data *led_dat =
	177	container_of(led_cdev, struct netxbig_led_data, cdev);
	178	enum netxbig_led_mode mode;
	179	int mode_val;
	180	int ret;
	181
	182	/* Look for a LED mode with the requested timer frequency. */
	183	ret = netxbig_led_get_timer_mode(&mode, delay_on, delay_off,
	184	led_dat->timer, led_dat->num_timer);
	185	if (ret < 0)
	186	return ret;
	187
	188	mode_val = led_dat->mode_val[mode];
	189	if (mode_val == NETXBIG_LED_INVALID_MODE)
	190	return -EINVAL;
	191
	192	spin_lock_irq(&led_dat->lock);
	193
	194	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
	195	led_dat->mode = mode;
	196
	197	spin_unlock_irq(&led_dat->lock);
	198
	199	return 0;
	200	}
	201
	202	static void netxbig_led_set(struct led_classdev *led_cdev,
	203	enum led_brightness value)
	204	{
	205	struct netxbig_led_data *led_dat =
	206	container_of(led_cdev, struct netxbig_led_data, cdev);
	207	enum netxbig_led_mode mode;
7b9d9d88	208	int mode_val;
24467832 SG	209	int set_brightness = 1;
	210	unsigned long flags;
	211
	212	spin_lock_irqsave(&led_dat->lock, flags);
	213
	214	if (value == LED_OFF) {
	215	mode = NETXBIG_LED_OFF;
	216	set_brightness = 0;
	217	} else {
	218	if (led_dat->sata)
	219	mode = NETXBIG_LED_SATA;
	220	else if (led_dat->mode == NETXBIG_LED_OFF)
	221	mode = NETXBIG_LED_ON;
	222	else /* Keep 'timer' mode. */
	223	mode = led_dat->mode;
	224	}
	225	mode_val = led_dat->mode_val[mode];
	226
	227	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
	228	led_dat->mode = mode;
	229	/*
	230	* Note that the brightness register is shared between all the
	231	* SATA LEDs. So, change the brightness setting for a single
	232	* SATA LED will affect all the others.
	233	*/
7b9d9d88	234	if (set_brightness)
24467832	235	gpio_ext_set_value(led_dat->gpio_ext,
7b9d9d88	236	led_dat->bright_addr, value);
24467832 SG	237
	238	spin_unlock_irqrestore(&led_dat->lock, flags);
	239	}
	240
	241	static ssize_t netxbig_led_sata_store(struct device *dev,
	242	struct device_attribute *attr,
	243	const char *buff, size_t count)
	244	{
	245	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	246	struct netxbig_led_data *led_dat =
	247	container_of(led_cdev, struct netxbig_led_data, cdev);
	248	unsigned long enable;
	249	enum netxbig_led_mode mode;
	250	int mode_val;
	251	int ret;
	252
7517611a	253	ret = kstrtoul(buff, 10, &enable);
24467832 SG	254	if (ret < 0)
	255	return ret;
	256
	257	enable = !!enable;
	258
	259	spin_lock_irq(&led_dat->lock);
	260
	261	if (led_dat->sata == enable) {
	262	ret = count;
	263	goto exit_unlock;
	264	}
	265
	266	if (led_dat->mode != NETXBIG_LED_ON &&
	267	led_dat->mode != NETXBIG_LED_SATA)
	268	mode = led_dat->mode; /* Keep modes 'off' and 'timer'. */
	269	else if (enable)
	270	mode = NETXBIG_LED_SATA;
	271	else
	272	mode = NETXBIG_LED_ON;
	273
	274	mode_val = led_dat->mode_val[mode];
	275	if (mode_val == NETXBIG_LED_INVALID_MODE) {
	276	ret = -EINVAL;
	277	goto exit_unlock;
	278	}
	279
	280	gpio_ext_set_value(led_dat->gpio_ext, led_dat->mode_addr, mode_val);
	281	led_dat->mode = mode;
	282	led_dat->sata = enable;
	283
	284	ret = count;
	285
	286	exit_unlock:
	287	spin_unlock_irq(&led_dat->lock);
	288
	289	return ret;
	290	}
	291
	292	static ssize_t netxbig_led_sata_show(struct device *dev,
	293	struct device_attribute attr, char buf)
	294	{
	295	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	296	struct netxbig_led_data *led_dat =
	297	container_of(led_cdev, struct netxbig_led_data, cdev);
	298
	299	return sprintf(buf, "%d\n", led_dat->sata);
	300	}
	301
	302	static DEVICE_ATTR(sata, 0644, netxbig_led_sata_show, netxbig_led_sata_store);
	303
588a6a99 JH	304	static struct attribute *netxbig_led_attrs[] = {
	305	&dev_attr_sata.attr,
	306	NULL
	307	};
	308	ATTRIBUTE_GROUPS(netxbig_led);
	309
cd010955 SG	310	static int create_netxbig_led(struct platform_device *pdev,
	311	struct netxbig_led_platform_data *pdata,
	312	struct netxbig_led_data *led_dat,
	313	const struct netxbig_led *template)
24467832	314	{
24467832 SG	315	spin_lock_init(&led_dat->lock);
	316	led_dat->gpio_ext = pdata->gpio_ext;
	317	led_dat->cdev.name = template->name;
	318	led_dat->cdev.default_trigger = template->default_trigger;
	319	led_dat->cdev.blink_set = netxbig_led_blink_set;
	320	led_dat->cdev.brightness_set = netxbig_led_set;
	321	/*
	322	* Because the GPIO extension bus don't allow to read registers
	323	* value, there is no way to probe the LED initial state.
	324	* So, the initial sysfs LED value for the "brightness" and "sata"
	325	* attributes are inconsistent.
	326	*
	327	* Note that the initial LED state can't be reconfigured.
	328	* The reason is that the LED behaviour must stay uniform during
	329	* the whole boot process (bootloader+linux).
	330	*/
	331	led_dat->sata = 0;
	332	led_dat->cdev.brightness = LED_OFF;
7b9d9d88	333	led_dat->cdev.max_brightness = template->bright_max;
24467832 SG	334	led_dat->cdev.flags \|= LED_CORE_SUSPENDRESUME;
	335	led_dat->mode_addr = template->mode_addr;
	336	led_dat->mode_val = template->mode_val;
	337	led_dat->bright_addr = template->bright_addr;
24467832 SG	338	led_dat->timer = pdata->timer;
24467832 SG	339	led_dat->num_timer = pdata->num_timer;
0c86ac2c SG	340	/*
	341	* If available, expose the SATA activity blink capability through
	342	* a "sata" sysfs attribute.
	343	*/
	344	if (led_dat->mode_val[NETXBIG_LED_SATA] != NETXBIG_LED_INVALID_MODE)
	345	led_dat->cdev.groups = netxbig_led_groups;
24467832	346
cd010955	347	return devm_led_classdev_register(&pdev->dev, &led_dat->cdev);
24467832 SG	348	}
24467832 SG	349
2976b179 SG	350	static int gpio_ext_get_of_pdata(struct device dev, struct device_node np,
	351	struct netxbig_gpio_ext *gpio_ext)
	352	{
	353	int addr, data;
	354	int num_addr, num_data;
	355	int ret;
	356	int i;
	357
	358	ret = of_gpio_named_count(np, "addr-gpios");
	359	if (ret < 0) {
	360	dev_err(dev,
	361	"Failed to count GPIOs in DT property addr-gpios\n");
	362	return ret;
	363	}
	364	num_addr = ret;
a86854d0	365	addr = devm_kcalloc(dev, num_addr, sizeof(*addr), GFP_KERNEL);
2976b179 SG	366	if (!addr)
	367	return -ENOMEM;
	368
	369	for (i = 0; i < num_addr; i++) {
	370	ret = of_get_named_gpio(np, "addr-gpios", i);
	371	if (ret < 0)
	372	return ret;
	373	addr[i] = ret;
	374	}
	375	gpio_ext->addr = addr;
	376	gpio_ext->num_addr = num_addr;
	377
	378	ret = of_gpio_named_count(np, "data-gpios");
	379	if (ret < 0) {
	380	dev_err(dev,
	381	"Failed to count GPIOs in DT property data-gpios\n");
	382	return ret;
	383	}
	384	num_data = ret;
a86854d0	385	data = devm_kcalloc(dev, num_data, sizeof(*data), GFP_KERNEL);
2976b179 SG	386	if (!data)
	387	return -ENOMEM;
	388
	389	for (i = 0; i < num_data; i++) {
	390	ret = of_get_named_gpio(np, "data-gpios", i);
	391	if (ret < 0)
	392	return ret;
	393	data[i] = ret;
	394	}
	395	gpio_ext->data = data;
	396	gpio_ext->num_data = num_data;
	397
	398	ret = of_get_named_gpio(np, "enable-gpio", 0);
	399	if (ret < 0) {
	400	dev_err(dev,
	401	"Failed to get GPIO from DT property enable-gpio\n");
	402	return ret;
	403	}
	404	gpio_ext->enable = ret;
	405
	406	return 0;
	407	}
	408
	409	static int netxbig_leds_get_of_pdata(struct device *dev,
	410	struct netxbig_led_platform_data *pdata)
	411	{
	412	struct device_node *np = dev->of_node;
	413	struct device_node *gpio_ext_np;
	414	struct device_node *child;
	415	struct netxbig_gpio_ext *gpio_ext;
	416	struct netxbig_led_timer *timers;
	417	struct netxbig_led leds, led;
	418	int num_timers;
	419	int num_leds = 0;
	420	int ret;
	421	int i;
	422
	423	/* GPIO extension */
	424	gpio_ext_np = of_parse_phandle(np, "gpio-ext", 0);
	425	if (!gpio_ext_np) {
	426	dev_err(dev, "Failed to get DT handle gpio-ext\n");
	427	return -EINVAL;
	428	}
	429
	430	gpio_ext = devm_kzalloc(dev, sizeof(*gpio_ext), GFP_KERNEL);
	431	if (!gpio_ext)
	432	return -ENOMEM;
	433	ret = gpio_ext_get_of_pdata(dev, gpio_ext_np, gpio_ext);
	434	if (ret)
	435	return ret;
	436	of_node_put(gpio_ext_np);
	437	pdata->gpio_ext = gpio_ext;
	438
	439	/* Timers (optional) */
	440	ret = of_property_count_u32_elems(np, "timers");
	441	if (ret > 0) {
	442	if (ret % 3)
	443	return -EINVAL;
	444	num_timers = ret / 3;
a86854d0	445	timers = devm_kcalloc(dev, num_timers, sizeof(*timers),
2976b179 SG	446	GFP_KERNEL);
	447	if (!timers)
	448	return -ENOMEM;
	449	for (i = 0; i < num_timers; i++) {
	450	u32 tmp;
	451
	452	of_property_read_u32_index(np, "timers", 3 * i,
	453	&timers[i].mode);
	454	if (timers[i].mode >= NETXBIG_LED_MODE_NUM)
	455	return -EINVAL;
	456	of_property_read_u32_index(np, "timers",
	457	3 * i + 1, &tmp);
	458	timers[i].delay_on = tmp;
	459	of_property_read_u32_index(np, "timers",
	460	3 * i + 2, &tmp);
	461	timers[i].delay_off = tmp;
	462	}
	463	pdata->timer = timers;
	464	pdata->num_timer = num_timers;
	465	}
	466
	467	/* LEDs */
	468	num_leds = of_get_child_count(np);
	469	if (!num_leds) {
	470	dev_err(dev, "No LED subnodes found in DT\n");
	471	return -ENODEV;
	472	}
	473
a86854d0	474	leds = devm_kcalloc(dev, num_leds, sizeof(*leds), GFP_KERNEL);
2976b179 SG	475	if (!leds)
	476	return -ENOMEM;
	477
	478	led = leds;
	479	for_each_child_of_node(np, child) {
	480	const char *string;
	481	int *mode_val;
	482	int num_modes;
	483
	484	ret = of_property_read_u32(child, "mode-addr",
	485	&led->mode_addr);
	486	if (ret)
	487	goto err_node_put;
	488
	489	ret = of_property_read_u32(child, "bright-addr",
	490	&led->bright_addr);
	491	if (ret)
	492	goto err_node_put;
	493
	494	ret = of_property_read_u32(child, "max-brightness",
	495	&led->bright_max);
	496	if (ret)
	497	goto err_node_put;
	498
	499	mode_val =
a86854d0 KC	500	devm_kcalloc(dev,
a86854d0 KC	501	NETXBIG_LED_MODE_NUM, sizeof(*mode_val),
2976b179 SG	502	GFP_KERNEL);
	503	if (!mode_val) {
	504	ret = -ENOMEM;
	505	goto err_node_put;
	506	}
	507
	508	for (i = 0; i < NETXBIG_LED_MODE_NUM; i++)
	509	mode_val[i] = NETXBIG_LED_INVALID_MODE;
	510
	511	ret = of_property_count_u32_elems(child, "mode-val");
	512	if (ret < 0 \|\| ret % 2) {
	513	ret = -EINVAL;
	514	goto err_node_put;
	515	}
	516	num_modes = ret / 2;
	517	if (num_modes > NETXBIG_LED_MODE_NUM) {
	518	ret = -EINVAL;
	519	goto err_node_put;
	520	}
	521
	522	for (i = 0; i < num_modes; i++) {
	523	int mode;
	524	int val;
	525
	526	of_property_read_u32_index(child,
	527	"mode-val", 2 * i, &mode);
	528	of_property_read_u32_index(child,
	529	"mode-val", 2 * i + 1, &val);
	530	if (mode >= NETXBIG_LED_MODE_NUM) {
	531	ret = -EINVAL;
	532	goto err_node_put;
	533	}
	534	mode_val[mode] = val;
	535	}
	536	led->mode_val = mode_val;
	537
	538	if (!of_property_read_string(child, "label", &string))
	539	led->name = string;
	540	else
	541	led->name = child->name;
	542
	543	if (!of_property_read_string(child,
	544	"linux,default-trigger", &string))
	545	led->default_trigger = string;
	546
	547	led++;
	548	}
	549
	550	pdata->leds = leds;
	551	pdata->num_leds = num_leds;
	552
	553	return 0;
	554
	555	err_node_put:
	556	of_node_put(child);
	557	return ret;
	558	}
	559
	560	static const struct of_device_id of_netxbig_leds_match[] = {
	561	{ .compatible = "lacie,netxbig-leds", },
	562	{},
	563	};
825fe38a	564	MODULE_DEVICE_TABLE(of, of_netxbig_leds_match);
2976b179	565
98ea1ea2	566	static int netxbig_led_probe(struct platform_device *pdev)
24467832	567	{
156189a6	568	struct netxbig_led_platform_data *pdata;
cd010955	569	struct netxbig_led_data *leds_data;
24467832 SG	570	int i;
	571	int ret;
	572
156189a6 MY	573	pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
	574	if (!pdata)
	575	return -ENOMEM;
	576	ret = netxbig_leds_get_of_pdata(&pdev->dev, pdata);
	577	if (ret)
	578	return ret;
24467832	579
a86854d0 KC	580	leds_data = devm_kcalloc(&pdev->dev,
a86854d0 KC	581	pdata->num_leds, sizeof(*leds_data),
cd010955 SG	582	GFP_KERNEL);
cd010955 SG	583	if (!leds_data)
24467832 SG	584	return -ENOMEM;
24467832 SG	585
cd010955	586	ret = gpio_ext_init(pdev, pdata->gpio_ext);
24467832	587	if (ret < 0)
8095c385	588	return ret;
24467832 SG	589
24467832 SG	590	for (i = 0; i < pdata->num_leds; i++) {
cd010955 SG	591	ret = create_netxbig_led(pdev, pdata,
cd010955 SG	592	&leds_data[i], &pdata->leds[i]);
24467832	593	if (ret < 0)
cd010955	594	return ret;
24467832	595	}
24467832 SG	596
	597	return 0;
	598	}
	599
	600	static struct platform_driver netxbig_led_driver = {
	601	.probe = netxbig_led_probe,
24467832	602	.driver = {
2976b179	603	.name = "leds-netxbig",
156189a6	604	.of_match_table = of_netxbig_leds_match,
24467832 SG	605	},
24467832 SG	606	};
24467832	607
892a8843	608	module_platform_driver(netxbig_led_driver);
24467832 SG	609
	610	MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
	611	MODULE_DESCRIPTION("LED driver for LaCie xBig Network boards");
	612	MODULE_LICENSE("GPL");
892a8843	613	MODULE_ALIAS("platform:leds-netxbig");